Jtdylktuy

When you launch RDP dialog and before you logon/connect to the remote computer, select the Display Tab and set your display configuration. If you want full screen mode, set the slider all the way to the right.

This is a known issue with systems running Windows 7 / Server 2008 R2 whose resolution is set at 1366×768. Microsoft has created a hotfix which you can read about / request here:

Remote desktop is not displayed in Full-Screen mode when the screen resolution is 1366× 768 pixels in Windows 7 or in Windows Server 2008 R2

If you're lazy or don't want to give MS your email, you can just download it from here. Just know that by doing so Microsoft will have no way of notifying you if there is a recall on the fix.

This is very similar to question Remote Desktop won't maximize--which offers helpful images of how to configure your RDP session prior to logging in.

Also, Craig's suggestion of pressing ctrl-alt-break works well if your session fails to maximize when logging in or if it randomly jumps out of full-screen mode while in a session.

Finally, if you happen to prefer having the RDP title bar visible at the top of the screen during full-screen mode, but without the annoyance of scrollbars to the right and bottom of your screen, open your saved .rdp session file in a text editor and edit the following lines:

screen mode id:i:1

desktopwidth:i:<set to screen width>

desktopheight:i:<set to screen height>

Consider adjusting desktopheight:i to a lower number than the screen height if you prefer to keep the taskbar of your local computer visible beneath the RDP window.

If you have win 7 SP1 it high recommended to update to new rdp client 8.1 :

Update for RDP 8.1 is available for Windows 7 SP1

It go to full screen automatically, or by right click in title bar.

I've also seen users not being able to maximize because of the Screen setting "Use multiple monitors for this connection" - when this is checked, the Full screen slider remains locked.

When you log in, in the dialog box where you put your username and password, there is a little drop down arrow in the bottom left for "Show options".
Under the display tab, first try full screen under Display Configuration. If that doesn't work, change it to the resolution of your screen -- mine is 1920x1080. This will allow you to go full screen.

I run 4 monitors, all of which are different. This confuses the RDM. Just change the resolution to your screen's maximum resolution and you should be fine.

I resolved a similar problem. I am using Windows 10 and RDPing into a Linux box. Setting my RDP to full screen mode and having the session maximized did not prevent horizontal and vertical scroll bars from appearing. To get rid of these bars, I saved my RDP connection settings by pressing Save As... on the first tab of the configuration. Then, I opened the saved .rdp file in a text editor (Notepad or Wordpad will work.) I then added this line to the top of the file, saved it and used this .rdp file to successfully log in without scroll bars:

smart sizing:i:1

I am Using Dell Latitude E5450 Laptop with windows 7.
Ctrl + Alt + Fn + B worked for me.

Though this thread is for RDP, I faced similar issue in RDCMan so sharing it FYI. I resolved it by unckecking "Lock Window Size" in View...

I solved this problem by going to the icons on my local toolbar and unpinning the most recent ones from my toolbar. Immediately, upon unpinning a password manager, my remote toolbar appeared.